TP-Link Archer C7 V2.0 - USB/Wifi Power

[Schnup89]

Hi all,

My Scenario:
TP-Link Archer C7 V2.0 with latest stable LEDE-Image 17.01.1
Huawei e3372h-153 for 4G Connectivity,
16GB USB-Stick for GCC-Compiler an other big-packages.

I've been struggling with my new Archer C7 V2.0 and loss of Wifi-Connection, the radios (2,4 & 5gh) automaticly disabled after a few minutes.

After many hours of troubleshooting (replacing ath10k-Firmware, changinng to LEDE-Dev-Buils, checking Wireless Config-Issues) I finally found out the issue.

It was the power consumption.
When I Plug out the USB-Stick and the external Antenna (on the E3372h) everything works fine.

Did someone have this "power-problem" with the USB-Ports too, or can reproduce it?
The Router works like charm, its just the wifi who will be deactivated, little bit strange

Schnup

[Klingon]

I have an Archer C7 V2 with a 4GB USB-Stick (f2fs type) and I have no problems with Wifi or the power consumption.

My LEDE version is:

Linux version 4.4.69 (buildbot@builds) (gcc version 5.4.0 (LEDE GCC 5.4.0 r4110-8adeb4e) ) #0 Sun May 21 21:56:17 2017

Sometimes a get a kernel warning, but the router is working like a charm.

[pepe2k]

@Schnup89

Did someone have this "power-problem" with the USB-Ports too, or can reproduce it?

Almost all TP-Link devices with USB have a current limit on USB 5V line around 500 mA. Plug your LTE stick over external USB HUB with own and good power supply.

[Schnup89]

@pepe2k

Almost all TP-Link devices with USB have a current limit on USB 5V line around 500 mA. Plug your LTE stick over external USB HUB with own and good power supply.

Didn't know that, thank you!
That would be nice information to display on the LEDE Archer C7-Techdata site.

[tmomas]

@Schnup89

That would be nice information to display on the LEDE Archer C7-Techdata site.

5V/500mA is USB standard. Why should we especially mention conformance to the USB standard?

[pepe2k]

@tmomas

5V/500mA is USB standard. Why should we especially mention conformance to the USB standard?

Actually, I think it does make sense to mention if the router is "USB 3/4G stick friendly", e.g. it allows USB device to take more than a (standard) 500 mA.

[tmomas]

An exception from the rules is well worth a note.

[Schnup89]

@tmomas

@Schnup89

That would be nice information to display on the LEDE Archer C7-Techdata site.

5V/500mA is USB standard. Why should we especially mention conformance to the USB standard?

I don't think it's a normal behavior that the wireless-radios drops on too high USB power consumption.
For some people it would be good to know.
On top, they maybe dont think about an power-problem if the USB-Devices (like my USB-Stick and my e3372h) are working allmost normal.

[Catfriend1]

I use USB storage and a bluetooth USB device on my Archer C7 and since I've added the BT stick the USB failures increased. Before with USB storage only I rarely had sudden unmounts due to power problems. With bt scanning every minute, it got worse. 7 days and the bt stick is no longer responding according to dmesg. I made a script that turns usb port 2 power off and on when that occurs to revive my bt stick.